• Zavarivanje i zavarene konstrukcije, Semester 2, position 1

The aim of this course is for students to become competent in the areas of materials and welding and also to develop appropriate academic skills needed for the future profession. This course is designed to provide informations through theoretical lectures, computational classes, seminar papers and through welding workshop practice.

Upon the successful completion of the course, the students are able to: • Understand the distribution of temperature in the material during welding, and the influence of heat input on metal solidification • Name all possible types of cracking (hot-, cold-, lamellar-, and reheat cracking) that may appear in the welding process, and to be able to differentiate between them • Understand the metallurgical aspects of various steel classes (carbon-, low alloyed, high alloyed, stainless), and select the proper welding technique and appropriate welding consumables • Understand the metallurgical aspects of weldability of different types of non-ferrous metals and alloys (Al and Al alloys; Cu and Cu alloys; Ni and Ni alloys; Ti, Zr, Mg and their alloys) • Understand the metallurgical aspects of the weldability of heterogeneous metals • Apply the concept of predicting crack appearance in the welded joint depending on the type of material and welding technology, in the goal to avoid the occurrence of damage and failure

Introduction. Physical basics of welding. Chemical reactions during welding. Welding thermal processes. Cracking phenomena in welded joints. Heat treatments of welded joints and CCT diagrams. Introduction to welding metallurgy of steels. The weldability оf unalloyed and high strength steels. Welding of creep resistant steels and steels for cryogenic and low temperature services. Welding of stainless and heat resistant steels. Welding of nonferous materials.

Residual stresses and distortions of welds. Structural changes in welded joints. Application of CCT diagrams. Heat treatment of welded joints. The weldability of different grade steels - Carbon equivalent (CE), Cr and Ni equivalents. Welding discontinuities and defects. Testing of welded joints. Joining of dissimilar materials. Welding of nonferous materials: Al, Cu, Ni, Ti, Mg, Zr, Ta and their alloys. Welding of cast irons and steels. Processes of joining nonmetalic materials (plastics, ceramics and composites). Practice in welding workshop.

Passed exams in Engineering materials 1 and Engineering materials 2. Attended course - Welding processes.

1. A Sedmak, V. Sijacki Zeravcic, A. Milosavljevic, V. Djordjevic, M. Vukicevic, Engineering materials, second part, Faculty of Mechanical Engineering, Belgrade, 2000. 2. V. Sijacki Zeravcic, A. Milosavljevic, A Sedmak, Manual for Engineering materials – Welding, Brazing and Casting, Faculty of Mechanical Engineering, Belgrade, 1996.

Total assigned hours: 75

New material: 22
Elaboration and examples (recapitulation): 8

Auditory exercises: 2
Laboratory exercises: 9
Calculation tasks: 4
Seminar paper: 15
Project: 0
Consultations: 0
Discussion/workshop: 0
Research study work: 0

Review and grading of calculation tasks: 0
Review and grading of lab reports: 0
Review and grading of seminar papers: 2
Review and grading of the project: 0
Test: 2
Test: 6
Final exam: 5

Activity during lectures: 5
Test/test: 50
Laboratory practice: 5
Calculation tasks: 0
Seminar paper: 10
Project: 0
Final exam: 30
Requirement for taking the exam (required number of points): 20

B. Sabo at all, Weldability stainless steels, N. Sad, 1995.; i. Hrivmjak, Weldability steels, Gradjevinska knjiga, Belgrade, 1982.; S. Kou, Welding Metallurgy, second edition, 2003.; R. Prokić Cvetković, O. Popović, Metalurgija zavarivanja, Mašinski fakultet Beograd, 2019.